Talc.
It's called the Ore
The Mohs mineral scale was named after German mineralogist Frederich Mohs (1773-1839)
Diamond, with a hardness of 10 on the Mohs scale.
Friedrich Mohs is famous for creating the Mohs scale of mineral hardness. He formulated a scale of one to ten and assigned each mineral a value. This eventually became the basis for the Mohs scale.
The fourth mineral on Mohs' Scale of Hardness is fluorite. It has a hardness of 4 on the scale.
The softest known mineral is 'TALC'. The hardest known mineral is 'DIAMOND' (according to Friedrich Mohs scale)
Ruby, a variety of the mineral corundum, has a hardness of 9 on the Mohs scale of mineral hardness.
This scale was proposed by the Austrian geologist Friderich Mohs.
Gypsum is the mineral listed at 2 on the Mohs hardness scale.
Talc is the softest mineral on the Mohs hardness scale, with a rating of 1. It is commonly used in cosmetics and as a lubricant.
Iodine is not recognized as a mineral, and therefore is not assigned a number on the Mohs Scale of mineral hardness.
The scale used to find a mineral's hardness is called the Mohs scale. It ranges from 1 (softest) to 10 (hardest), with each mineral tested against known reference minerals to determine where it falls on the scale based on its ability to scratch or be scratched by the reference minerals.